A Tip on changing 3 phase AC motor rotation

td456

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# U1 m! I0 k  j/ U, U9 TWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
; i1 g: J$ I/ H0 ]- nBut for VFD application you need to do the swap after the inverter.
+ _& l" |! R* s: OIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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; O, w* L# m4 n8 {$ n1 r5 E/ VAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

9 Y4 ?) w+ B9 y' a( |1 n$ b+ XThe phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.

) D* \+ v9 y- O7 a. n" ZThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.

jiodiangong

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